physical science

In an electromagnetic wave, the electric field is

perpendicular to both the magnetic field and the wave direction.

A 80-dB sound carries more energy than a 40-dB sound by a factor of

10,000.

The musical note A has a frequency of 440 Hz and its wavelength in seawater is 3.5 m. The speed of sound in seawater is

1540 m/s.

A frequency that is not an overtone of the fundamental frequency F is

F/2.

Radio amateurs are permitted to communicate on the "10-meter band". What frequency of radio waves corresponds to a wavelength of 10 meters? The speed of radio waves is 3 × 108 m/s.

3.0 × 107 Hz

A boat at anchor is rocked by waves whose crests are 50 m apart and whose speed is 10 m/s. These waves reach the boat once every

5 s.

To an astronaut in orbit around the earth the sky appears

black.

A sound wave whose frequency is 50 Hz

has a relatively long wavelength.

The setting sun appears red because its light is

scattered.

The wavelength of the wave shown in the figure is A= up and down C= on top of the curve

D.

Light of which of the following colors is scattered most in the atmosphere?

blue

Which of the following is not a property of an electromagnetic wave?

electric charge

Ultrasound refers to sound whose

frequency is too high for most people to hear.

The property of light waves that leads to the phenomenon of color is

frequency.

When a sound wave goes from air into water, the quantity that remains unchanged is its

frequency.

In a transverse wave, the individual particles of the medium move

perpendicular to the direction of travel.

When the American flag is viewed with red light it appears

red and black.

The ionosphere

reflects radio waves.

Sound waves of frequency 300 Hz have a wavelength relative to sound waves in the same medium of frequency 600 Hz that is

twice as great.

An example of a wave that is partly longitudinal and partly transverse is a

water wave.